Nicole Richie pulled an April Fool's prank on fiance Joel Madden and pal Kim Kardashian by hacking into their Twitter accounts and posting a string of naughty messages on Thursday, including tweets to Dolly Parton, Sharon Osbourne, Paula Abdul and Ashley Tisdale.

Richie ensured she would leave her lover red-faced, by telling Osbourne she was "yummy," asking Abdul if Madden could "smell her armpits," and tweeting Parton to see if she had any "milk in those jugs."